rdblue commented on code in PR #6437:
URL: https://github.com/apache/iceberg/pull/6437#discussion_r1056513380
##########
python/pyiceberg/schema.py:
##########
@@ -1046,3 +1055,79 @@ def _project_map(map_type: MapType, value_result:
IcebergType) -> MapType:
value_type=value_result,
value_required=map_type.value_required,
)
+
+
+@singledispatch
+def promote(file_type: IcebergType, read_type: IcebergType) -> IcebergType:
+ """Promotes reading a file type to a read type
+
+ Args:
+ file_type (IcebergType): The type of the Avro file
+ read_type (IcebergType): The requested read type
+
+ Raises:
+ ResolveException: If attempting to resolve an unrecognized object type
+ """
+ raise ResolveException(f"Cannot promote {file_type} to {read_type}")
Review Comment:
What about when this is called with the same type? How about this:
```python
if file_type == read_type:
return file_type
else:
raise ResolveError(f"Cannot promote {file_type} to {read_type}")
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